Renewable energy is getting better all the time, but no-ones yet worked out a good way to store the juice for those cloudy, windless days. Batteries do work, but given the high cost of swapping out the cells for your EV, we doubt that Duracell will start making a five-megawatt version any time soon. Thats why British company Isentropic is developing a system that could store energy in cells that are filled with gravel.
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